#include <TimerOne.h>
#define LED_PIN 2
#define TIMEOUT 4000
#define TASTER_PIN 3 
static bool ledState = LOW ;
void toggleLed (){
Timer1.start();
  ledState = !ledState; // LED Zustand toggeln
  digitalWrite(LED_PIN, ledState);
}
void timeoutISR() {
Timer1.stop ();  
 }

 void setup()
{ 
  pinMode (LED_PIN, OUTPUT);
  pinMode (TASTER_PIN, INPUT_PULLUP); 
  attachInterrupt(digitalPinToInterrupt(TASTER_PIN),toggleLed, CHANGE);
  Timer1.initialize(TIMEOUT);
  Timer1.attachInterrupt(timeoutISR);
 
  

}
void loop () {
}